Signal-lamp bracket.



M B. WILLISTON.

SIGNAL LAMP BRACKET.

APPLIOATIOH rum) MAY 16, 190,8.

970,770. Patented Sept. 20, 1910.

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SIGNAL LAMP BRACKET.

nrmoynon rum) MAY16,-1008.

970,770. Patented Sept. 20, 1910.

3 SHEETS-SHEET 3,

of Fig. 1; .5 line 3--3 of Fig. 2; Fig.4 1s a detail eleva- I 'modified form of construction; and

UnITED STATES" PATENT. OFFICE.

M BROOK WILLISTON.

OF DETROIT, MICHIGAN. ASSIGNOR TO THE ADAMS & WESTLAKE COMPANY, A CORPORATION OF ILLINOIS.

SIGNAL-LAMP BRACKET.

- Specification of Letters Patent.

' Application filed May 16, 1908. Serial No. 433,217.

i for attachment to a railway car or engine,

or to a switch signal stafl.

The recent development of reflectors and lenses for railway signal lamps, whereby the light is condensed into a slender shaft, renders it necessary to provide for accurate adjustment of the lamp in order that this beam of light may be properly directed; and the object of this invention 1s to provide an adjustable bracket which will facilitate the accurate positioning-of the lamp and its readjustment in case of displacement in use. This object is attained by the construction hereinafter described, and which is illustrated in the accompanying drawings, in

0 which Fiire 1 1s a side elevation of the bracket; Fig. is an elevation thereof-from a point of view ninety degrees removed from that Fig. 3 1s a sectional view on the tion of a semaphore column withvthe bracket ap lied thereto; Figs. 5 and 6 are details of ad usting plates forming parts of the bracket; Fig. 7 is a detail of a lead washer L0 used in connection with the bracket; Fig. 8

is a detail side elevation, partly in sectlon, of the bracket rovided with a modified .form of lamp ho der; Fig. 9 is a detail elevation of the same from a different point of L5'.-view;'Fi1g1. 10 is a plan view, artly in section, ,of t bracket shown in igs. 8 and 9; Flgfi ll is a view similar to Fig. 3 showing a Fig. 12 is a plan view of the device as shown in so Fig. 11.

The bracket comprises two main elements 15, 16, the part 15 comprising a-- wall plate 17 adapted for attachment by any suitable means to a support, such as the semaphore 55 column 18, At the .upper end of the plate .washer when the bolt is turned up tightly,

17 is a laterally projecting plate 19, the upper surface of which is convex, having the form of a section of a sphere, as shown at 20, the lower face of the projection being shown as convex, though not necessarily having that shape. 3

The upper member 16 of the bracket comprises a body portionor staff 21 for engagement with the lamp 2-,and a lateral projection 23 at its foot, the lower faceof which is concave and complementary to the upper face of the projection 20, upon which it is seated. The projections and 23 are ver-.

tically and centrallygapertured to receive a bolt 24, the aperture in the part 20 being preferably threaded for engagement therewith, and the a erture 25 in the part 23 being considerably lar er than the.bolt to allow for movement 0 the member 16 in elfecting the adjustment. The upper face of the part 23 is concentric with its lower face, and a washer 26 interposed bet-ween this member and the head of the bolt 24 is correspondingly curved. A nut 27 is applied to the lower end of the bolt 24, and a washer 28 is inter osed between this nut and the member 20. Vhen the bolt is in threaded engagement with the member 20, the office of the nut 27 is to lock the bolt against working loose. A washer 29 of soft material, such as lead or leather, is preferably inserted between the member 20 and 23, each of the latter, when such washer is used, being provided on their adjacent faces with short projections 30, 31, which sink into the and more securely prevent accidenta placement of the bracket.

By the construction described, the upper member 16 of the bracket maybe adjusted in any direction for the purpose of'properly. positioning the lamp.

In the construction illustrated in Figs. 8, 9 and 10, the same provision is made for adjustment. In these figures the invention is shown as applied to a bracket having" a tripod for carrying the lamp. The lower member of the bracket consists of the wall plate 32 having the lateral extension 33 at its upper end, upon which is provided a convex seat 34 for the upper member of the disbracket. The upper member of the bracket of the base 35 being concave, and the curra ture corresponding to that of the part 34.

' The same form of clamping bolt 24: and soft of the lamp in horizontal plane.

' jection the app In Figs 11 and 12 is ShO\VI1' & II1OCllfi8(1 form of construction in which' stops for roughly positioning the lamp are app ied to the form of bracket illustratedv in Figs. 1, 2 and 3. The lateral projection 23 is pro videclnvith a toe 43 which enters between a pair of stops 6L4, 4 5,shown as taking the form of screwsset in the plate 19.

1; In a signal lamp bracket, in combination, arigid member adapted for attachment to apsuppor't and having a lateral proer'face "of which is curved to the section avsphere, 'a lamp carrying member having a beari'ng face of complementary curvature andresting upon the curved face, offthe firstv named member, a binding bolt passingthrough the engaging portions of the two members,the bolt opening in one of them being larger than the bolt. I Q

2. In a signal lamp 'bracket, in combination, a member, adapted for attachment to a supportand having a,'lateral projection, a

member adapted to carry a lamp having -a lateral projection resting upon and bolted tojthe projectibn of th e'first namedv member, the engagingfaces of {projections being curved to a sect-ion of sphere and the bolt hole of one being'of 'grea ter diameter than the securing bolt. Y I 3. In a" signal lamp bracket, 'incombination, an L-shaped memb er adapted for.fat' tachmentto a support, the upper faceofit'sj lateral projection beingcurved' toa section of a sphere, a lamp-carrying member seated on suchcurved surface and' beingbolted',

thereto, the bolt-hole in one ofthe members I' being larger than the bolt, and a lug on one member entered loosely between stops on the other member.

4. In avsignal lamp bracket, in combination, a member adapted for attachment to-a support and having a bearing face conforming to a scctionof a sphere, a lamp-supporting member having a bearing face complementary to the bearing face of the other member, such bearing faces being uneven, a washer of soft material interposed between the bearingfaces, and a clamping member for adjustably binding together such two first-named members. t 5. In a signal lamp bracket, in'combination a bracket member having a horizontal I sole plate, the upper face of which is curved to the section of a sphere, a lamp carrying.

member having a lateral extension resting on the sole plate its lower face conforming to the upper face thereof, a binding bolt uniting the sole plate and extension and be ing rigidly set in one of the members,t" aperture in the other member bein greater diameter than the bolt.

6. In a signal lamp bracket, in com tion a bracket member. having a ho sole plate, the upper face of which is,:cu to the section of a sphere, a lamp. carrying lower face conforming to. the upper face rved l' member superposed upon the sole 'plate,1 ts' thereof, a binding bolt uniting the sole plate and lamp carrying member and being rig-f idly set in one of such members, the aperture in the, other member being larger than the bolt.

7. In a signal lamp support, in combiIiaQ i tion, a bracket member having a horizontal.

sole, plate, the upper face of which iscurve'd tothesection of a sphere, a lamp carrying},

member superposed upon the sole late,iits lower face conformmg to pa'ssingthr ough an larger than the stud.

WVitnessesr i LooIsK. GILLson, .1. 1

the up er faIce thereof, a stud for clampingtogether theft sole plate and lamp carrying member and being rigidly secured,- to one. thereof ,and

aperture in the other A ecca i 

